Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbd02f6f2cf79ab…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 15:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 492f2c329988a98ed4f0e4ebcc02a806 SHA-1: 55db8ff76289e25e77132a83affd7ad64fe93dc7 SHA-256: 5bbd02f6f2cf79abd792831ddfb46d3e5bea179ad69674407acb47436794b59f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ieeepes-thailand.org/app/webroot/files/files/fazupumewurabupetexu.pdf In PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/mumebaxoxosokikowuva.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/63623218258.pdfIn PDF document text
    • http://slsnn.ru/content/files/8764915948.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/81732725156.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/34034923813.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/xonozotopabug.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/pisagiwujopimajifoboruja.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/46871081290.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/folovuwoze.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/fovamawetasurovuripasu.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/godojojunu.pdfIn PDF document text
    • https://negaratoto.com/contents/files/rupelavasuxiletosamuvig.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/efv97von48ptqr8detp4818gg0/50156443234.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210905_0DE98CA8D4B6578B.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/90683031029.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/58131414239.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tipijasojukiwafotomonuma.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/xobalotegujijenuju.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/74724914331.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/fepakawokozajakisipub.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/zumupedi.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613299d1eec8b---16519767288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=never+get+lost+again+appPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10468 bytes
SHA-256: 0bec126da40131f33511771ff0439adb595cd2e9992b41a94b8ce14d912a056e
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 17772 bytes
SHA-256: b9e5023fcb71e75f672cf43b756ea802fa83d84ee1b6df137da645cd59acfcfa